Switch-plug.



'PATENTED FEB.18,1908. H. c. PROBLIGH.

SWITCH PLUG.

APPLIGATIQN FILED AUG. 12,1903.

ing like tion.

insirn einer rai-n einen HENRY C. FROELICH, OF CHICAGO, IILLINOIS, ASSIGNOR TO BENJAMIN ELECTl-HCy MANUFAGTURlNG'COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLI- N OIS No. sregeo.

Specification of Letters Patent.k Appiitnion flied .August 12. 190s. serai No. 169.173.

Patented rei. is, isos.

To all whom t may concern.'

.Be it knownthat I, HENRY C. FROELICH, a resident of Chicagq'in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Switch- The invention relates to plugs adapted to be-inserted into sockets to attach electrical Lconductors andvto establish Aelectrical con-' nections, and designs to provide an improved sWitch-plug which can be quickly inserted into and secured in a socket.

The invention further designs to .provide a plug which can be inserted into a socket having a screw-threaded ring which serves as a conductor-terminal, e. g., those commonly known as Edison sockets, thisinsertion being accomplished without rotation of one of the parts to establish connection therebetween.

The invention consists in vthe several novel features hereinafter set forth and and Fig.'6 is a section on the line 6 6 of Fig. 4.

The plug comprises a cup-shaped body 10, a'cap 11, having an integral central post 12 guided in an opening 13 formed in the body, and a sh ik adapted to enter a socket and formed of sections l14 pivotally sustained by the-body. The cap and body are formed of insulating material and are slid- .ably connected, so that relative longitudinal movement of one with respect to the other will' spread the shank-sections. The shanksections are pivotally sustained in such man'- ner that they can be s read into engagement with a socket and veac comprises a body of insulating material and acorrugated metallic contact-strip 16, adapted to it snugly a ainst the screw-threaded terminal ring 17 o a socket, and an integral, semicircular A stri 18 having its ends pivcted to opposite y arranged depending ears 19 of a terminal-plate 20. secured to the'inner face of Plugs, of which the following isa specilicabody 10, by screens 21.r Screws 15 secure sections 14 to strips 16.' ,One of the lineconductors 22 is connected to plate 20 by a screw 23. Eachof the shank-sections is cut away as at 24, lso that post 12 can pass therebetween, and is curved or inclined as at 25 so that the post will spread tlieshank-sections. The edges of notches 24 are engaged by post 12 when the ost is therebetween and thereby the shan r-sections are held in spread relation (Fig. 2). A. contacttip 26, adapted to engage/a s ring-terminal 41 of a socket, is secured tot e end of post I2 by a screw 27 which electrically connects the tip and an inturned extension 28 of a metallic strip 29 which is secured at one side of ost 1.2. wit a terminal plate 30 secured to body 10' by a screw 31, and whereto the other lineconductor 32 is connected by a .screwv 33.y Strip 29 andplate 30 aref' disengaged when post 12 is withdrawn, and constitute a connection which is broken'as soon as the tip has been .moved away from socket-terminal 41 to avoid a current arc between the tip and socket terminal. Post 12 and opening 13 are of corresponding non-cylindriccontour so that the cap and the body are held relatively non-revoluble. cient size to engage the end of a socket and thus longitudinally positions -the shank in the socket. The line-adres 22, .32. enter the Strip 29 is adapted to contactpocket formed between the cap and body vthrough a hole 54 centrally formed in the cap. A ring 35 of insulating material is secured to the cap and closes the openingv between the body and the cap xif'hen these are' separated.

When the plug is to be attached to asocket, the cap and the .body will be in separated relation, as shown in F ig'. 3,., The shank is then contracted so that it can readily enter a socket. When the contracted shank has been placed in' a socket, the cap is forced inwardly to spread the 'shank-sections into firm engagement with the socket, and to Vslide strip 29 into contact with line-terminalplate 30. Friction between the shank-sections and the post, secures the cap in ass gned position. 'The electrical circuit then established extends through conductor 22, plate 20, ears 19,- strips 16, 16 to socketterminal 17- and from socket-terminal 41 through tip 26, screw, 27, strip 29, plate 30 to the other line-conductor 32. Vvhen the Atac ment of the plug are quickly effected;

The same movement brings the contact-tip into and out of connection with Aone of the line-conductors.

The invention is not to be understood as restricted/to thel precise details herein'described since these can be modified wit-hout de arting from the spirit of the invention,

aving thus described the invention, what I claim as new and desire to secure by Letters Patent is l 1. A switch-plug comprising the combination of a body, a longitudinally movable post, a cap integrally formedwith the post, a contact-ti carried by said post, and a contact-strip a apted to engage a socket-terminal and sustained by saidzbod y, and shifted laterally into position to engagethe socket bylongitudinal movement of the post.

2. A switch-plug comprising the combination of a body, a longitudinally movable cap, aQ post secured to the c ap, a contact-tip carried by the ost and a shank comprising laterally movable sections `connected with the body and having a contact-strip secured thereto, and shifted, by longitudinal movement of the cap in ,one direction, into position to secure the plug in a socket.

3, A switch-plug comprising the combination of a body, a longitudinally movable member, a shank comprising pivotally sustained sections, a contact-strip for engagement with a socket and secured to the shank, a contact-tip carried by said member and means spreading said sections .when said member 1s moved longitudinally in one direction.

4. A switch-plug comprising the combination of a body, a longitudinally movable cap having a post secured thereto, a terminalplate secured to said body,and having Iears and a shank comprising sections pivotally secured to said ears and a pair of contactstrips secured to' the sections, said sections being spread by said post when the post is shifted longitudinally in one direction.

.5. A switch-plug comprising the com-,i

bination of a body, a longitudinally movable post, means operated by longitudinal movement of said post and whereby the body can be attached to a socket, a pair of line-terminals, a pair of contacts one of which is carlsite side of said base, a Aca bmdmg-screws and movab e relatlvely to ried by said post, and a make-and-break connection between the tip and one of said terminals, operated by shift of said post.

6; A switch-plug comprising a body, a longitudinally movable post, ,carrying a contact-tipV and avstrip connected to said tip, a

terminal-plate secured to thebody and en- `two relatively-movab e parts and arranged to provide a chamber therebetween, an expanding outer contact carried by one of said parts, .means carried by the other of said parts for expanding said outer contact "when said parts are relatively moved, an end contact, and means within said chamber for connecting circuit wires with said contacts.

8. In an attachment plug, the combination of a base, a conducting plate on one side thereof, means arranged on the other side of said base for connecting circuit wires, a movable cap covering said connecting means, and means arranged to shift said plate laterally when said cap is moved toward said base.

9. In an'attachment plu the combination of a base, a laterally-Inova le contact on one side of said base, binding-screws on the oppocovering said said base,'and means for shifting said laterally-'movable contact by movingl the cap and base toward each other.

10.l In an attachment lug, the combination of a base, a pair o contact members pivoted thereto, a cap adapted to telescope with said base, and, means carried by said cap. and adapted'when said cap and base are moved toward each other, to be thrust between'said contact members and. thereby to shift the same laterally. K

11. An attachment plug ada ted for cooperating with a screw-threade socket, and comprising contacts to engage the terminals of the socket, an enlar ed body ortion consisting of two relative y movab e members having a chamber formed between the same, binding posts arranged in said chamber, and means operated by the relative movement of said members for moving one of said contacts laterally into engagement with a terminal of the socketl 12. An attachment plug for coperating with a socket having a ring terminal, comprising an insulating split shank carrying -.ber, and: means fo!;...se' arating the parts of k rable shank als'omounted upon said member, 10 f said 'shan1-t I 'saidn'lans eing'operatedby the eontactsrips arranged upon the exterior of relatve movement ofsaid members. said vshank and means operated by the rela- 13. Anv attaehment plugvjcomprisng an #le meifement of said'member'afor separat- I enlarged' `,body rtion v c zons'iszing of vtwo-1 ing-said shank. v 4

` relatively movab e members having a cham-V, Y, f HENR Y C. FROELIOH.

berfornmd between the same, binding oste: 1v `W`1tnesses: l mounted Within said ehambe'ronzone o said PH, KOEHLEB,

.members, an. insuletinglohgitndinally sepa- JOHN MLANE. 

